Write a program that carries out the following tasks: Open a file with the name hello.txt; Store the message "Hello World!" in the file; Close the file; Open the same file again; Read the message into a string variable and print it. The program should be designed to handle a 'File not found' exception.

It has to follow the format below:

import java.io.*;

public class Hello_World { public static void main(String [] args) throws FileNotFoundException { PrintStream output = new PrintStream(new File("hello.text")); output.println("Hello World!"); output.println(); } }